best is to add to entropedia, it will work it out for you, ive added your figure and its Damage/PEC: 2.940 HP. very good
might be best to do a 2nd test to confirm,
this is how i do it
" Put the item in the TT.
Add fruit to the TT until you find the exact amount where the value increases 1 PEC.
Write down the TT value and number of fruit needed.
Determine the real value by doing: (Initial value in PEC) + (1 PEC - (number of fruit/1000)) (where number of fruit/1000 is the value of the fruit in PEC)
Cancel the trade, and use the item one time.
Repeat 1 to 4.
Calculate the difference by subtracting the exact value before and after you used the item. The difference will be the exact decay."
most times i use it 10 times then work out the decay and divide by 10 for the average